282 lines
6.4 KiB
C
282 lines
6.4 KiB
C
/* OpenBSC Abis interface to mISDNuser
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*
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* (C) 2008 by Harald Welte <laforge@gnumonks.org>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <mISDNif.h>
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#define AF_COMPATIBILITY_FUNC
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#include <compat_af_isdn.h>
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#define NUM_E1_TS 32
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/* data structure for one E1 interface with A-bis */
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struct mi_e1_handle {
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struct gsm_bts *bts;
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/* The mISDN card number of the card we use */
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int cardnr;
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/* The RSL adress */
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struct sockaddr_mISDN l2addr;
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/* The OML adress */
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struct sockaddr_mISDN omladdr;
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struct gsm_fd fd[NUM_E1_TS];
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};
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#define SAPI_L2ML 0
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#define SAPI_OML 62
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#define SAPI_RSL 63
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#define TEI_L2ML 127
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#define TEI_OML 25
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#define TEI_RSL 1
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static void hexdump(unsigned char *buf, int len)
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{
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int i;
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for (i = 0; i < len; i++) {
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fprintf(stdout, "%02x ", buf[i]);
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}
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fprintf(stdout, "\n");
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}
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#define TS1_ALLOC_SIZE 300
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static int handle_ts1_read(struct bsc_fd *bfd)
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{
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struct mi_e1_handle *e1h = bfd->data;
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struct msgb *msg = msgb_alloc(TS1_ALLOC_SIZE);
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struct sockaddr_mISDN l2dadr;
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socklen_t alen;
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if (!msg)
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return -ENOMEM;
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msg->bts = e1h->bts;
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alen = sizeof(l2addr);
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ret = recvfrom(bfd->fd, msg->data, 300, 0,
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(struct sockaddr *) &l2addr, &alen);
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if (ret < 0) {
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fprintf(stderr, "recvfrom error %s\n", strerror(errno));
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return ret;
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}
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if (alen != sizeof(l2addr))
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return -EINVAL;
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msgb_put(msg, ret);
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DEBUGP(DMI, "alen =%d, dev(%d) channel(%d) sapi(%d) tei(%d)\n",
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alen, l2addr.dev, l2addr.channel, l2addr.sapi, l2addr.tei);
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DEBUGP(DMI, "<= len = %d, prim(0x%x) id(0x%x)\n",
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ret, hh->prim, hh->id);
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switch (hh->prim) {
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case DL_INFORMATION_IND:
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DEBUGP(DMI, "got DL_INFORMATION_IND\n");
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struct sockaddr_mISDN *sa;
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char *lstr = "UNKN";
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switch (l2addr.tei) {
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case TEI_OML:
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sa = &e1h->omladdr;
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lstr = "OML";
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break;
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case TEI_RSL:
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sa = &e1h->l2addr;
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lstr = "RSL";
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break;
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default:
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continue;
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}
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DEBUGP(DMI, "%s use channel(%d) sapi(%d) tei(%d) for now\n",
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lstr, l2addr.channel, l2addr.sapi, l2addr.tei);
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memcpy(sa, &l2addr, sizeof(l2addr));
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break;
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case DL_ESTABLISH_IND:
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DEBUGP(DMI, "got DL_ESTABLISH_IND\n");
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break;
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case DL_ESTABLISH_CNF:
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DEBUGP(DMI, "got DL_ESTABLISH_CNF\n");
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break;
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case DL_RELEASE_IND:
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DEBUGP(DMI, "got DL_RELEASE_IND\n");
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break;
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case MPH_ACTIVATE_IND:
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DEBUGP(DMI, "got MPH_ACTIVATE_IND\n");
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break;
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case MPH_DEACTIVATE_IND:
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DEBUGP(DMI, "got MPH_DEACTIVATE_IND\n");
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break;
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case DL_DATA_IND:
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DEBUGP(DMI, "got DL_DATA_IND\n");
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msg->l2_off = MISDN_HEADER_LEN;
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hexdump(msgb_l2(msg), ret - MISDN_HEADER_LEN);
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switch (l2addr.tei) {
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case TEI_OML:
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ret = abis_nm_rcvmsg(msg);
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break;
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case TEI_RSL:
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ret = abis_rsl_rcvmsg(msg);
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break;
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default:
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fprintf(stderr, "DATA_IND for unknown TEI\n");
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break;
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}
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break;
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default:
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DEBUGP(DMI, "got unexpected 0x%x prim\n", hh->prim);
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break;
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}
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return ret;
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}
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static int handle_ts1_write(struct bsc_fd *bfd)
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{
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struct mi_e1_handle *e1h = bfd->data;
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/* FIXME: dequeue a pending msgb for RSL / OML */
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/* prepend the mISDNhead */
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hh = (struct mISDNhed *) msg_
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hh->prim = DL_DATA_REQ;
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/* FIXME: send it off */
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}
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static int handle_tsX_read(struct bsc_fd *bfd)
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{
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/* FIXME: read from a B channel TS */
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}
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static int handle_TsX_write(struct bsc_fd *bfd)
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{
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/* FIXME: write to a B channel TS */
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}
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/* callback from select.c in case one of the fd's can be read/written */
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static int misdn_fd_cb(struct gsm_fd *bfd, unsigned int what)
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{
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unsigned int e1_ts = bfd->priv_nr;
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int rc = 0;
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switch (e1_ts) {
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case 1:
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if (what & BSC_FD_READ)
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rc = handle_ts1_read(bfd);
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if (what & BSC_FD_WRITE)
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rc = handle_ts1_write(bfd);
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break;
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default:
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if (what & BSC_FD_READ)
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rc = handle_tsX_read(bfd);
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if (what & BSC_FD_WRITE)
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rc = handle_tsX_write(bfd);
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break;
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}
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return rc;
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}
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static int mi_setup(devinfo_t *di)
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{
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int ts, sk, ret;
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struct mISDN_devinfo devinfo;
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sk = socket(PF_ISDN, SOCK_RAW, ISDN_P_BASE);
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if (sk < 0)
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fprintf(stderr, "could not open socket %s\n", strerror(errno));
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return sk;
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}
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ret = ioctl(sk, IMGETCOUNT, &cnt);
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if (ret) {
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fprintf(stderr, "error getting interf count: %s\n",
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strerror(errno));
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close(sk);
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return -ENODEV;
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}
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DEBUGP(DMI,"%d device%s found\n", cnt, (cnt==1)?"":"s");
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#if 0
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devinfo.id = di->cardnr;
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ret = ioctl(sk, IMGETDEVINFO, &devinfo);
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if (ret < 0) {
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fprintf(stdout, "error getting info for device %d: %s\n",
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di->cardnr, strerror(errno));
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return -ENODEV;
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}
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fprintf(stdout, " id: %d\n", devinfo.id);
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fprintf(stdout, " Dprotocols: %08x\n", devinfo.Dprotocols);
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fprintf(stdout, " Bprotocols: %08x\n", devinfo.Bprotocols);
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fprintf(stdout, " protocol: %d\n", devinfo.protocol);
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fprintf(stdout, " nrbchan: %d\n", devinfo.nrbchan);
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fprintf(stdout, " name: %s\n", devinfo.name);
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#endif
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/* TS0 is CRC4, don't need any fd for it */
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for (ts = 1; ts < NUM_E1_TS; ts++) {
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unsigned int idx = i-1;
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struct bsc_fd *bfd = &e1h->fd[idx];
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struct sockaddr_mISDN addr;
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if (ts == 1)
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bfd->fd = socket(PF_ISDN, SOCK_RAW, ISDN_P_LAPD_NT);
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else
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bfd->fd = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_RAW);
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if (bfd->fd < 0)
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fprintf(stderr, "could not open socket %s\n",
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strerror(errno));
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return bfd->fd;
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}
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memset(&addr, 0, sizeof(addr));
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addr.family = AF_ISDN;
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addr.dev = e1h->cardnr;
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if (ts == 1) {
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addr.channel = 0;
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addr.sapi = 0;/* SAPI not supported yet in kernel */
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addr.tei = TEI_L2ML;
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} else
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addr.channel = ts;
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ret = bind(bfd->fd, (struct sockaddr *) &addr, sizeof(addr));
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if (ret < 0) {
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fprintf(stdout, "could not bind l2 socket %s\n",
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strerror(errno));
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return -EIO;
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}
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}
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}
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